Research Grants Council of the Hong Kong Special Administrative Region, China

HKU7434/04M

Funding Information:

The authors wish to thank Mr. Oliver Brill and the scientists of Otodynamics Ltd. (UK) for their generous assistance in providing detailed OAE parameters and algorithms for the ILO system. We are grateful to Chris X.G. Wang, Dr. S.C. Chan and the anonymous reviewers for their invaluable comments on an earlier version of the manuscript. The work was partially supported by a Grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (HKU7434/04M).